Since it’s launch, iAd has emerged as a powerful new way for advertisers to reach millions of iPhone and iPod touch users. iAd has signed on over half of the top 25 leading US national advertisers in just four months, with a projected 21 percent share of US mobile display advertising revenue for 2010 according to research firm IDC.

Andy Miller, Apple’s vice president of iAd, comments;

“We’re thrilled to add leading global brands to the iAd Network in Europe and create even more great opportunities for developers. In just four months, we’ve doubled the number of advertisers on the network and thousands of developers now have a valuable new source of revenue.”

iAd, which is built into iOS4 lets users stay within their current app while engaging with an ad – even while watching a video, playing a game or while browsing the iTunes store. Apple says user iAd engagement times average more than 60 seconds per visit.

In line with what Apple CEO, Steve Jobs called ‘the industry standard’, developers will receive 60 percent of the iAd revenue, whilst Apple will retain 40 percent.